SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02cfad971218c5b745adb649ff94ee6a80323dfc47177f50005ce207e63877cd' 
  AND token = 'fsLxJUJhWDwOHoyYMrKVcoFlBE/AZyM3GqXjWPcu4LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}